Ameliorative roles of biochar-based fertilizer on morpho-physiological traits, nutrient uptake and yield in peanut (Arachis hypogaea L.) under water stress

Junlin Zheng, Shujun Wang, Ruimin Wang, Yinglong Chen, Kadambot H.M. Siddique, Guimin Xia, Daocai Chi

Research output: Contribution to journalArticlepeer-review

Abstract

Biochar-based fertilizers increase soil fertility, nutrient uptake, and crop yield. However, the response of peanut (Arachis hypogaea L.) growth to biochar-based fertilizer under water stress and the associated mechanisms are not well-understood. In this study, a two-year pot experiment using a split-plot design was performed to investigate the effect of biochar-based fertilizer (BF0, 0 t ha–1; BF0.75, 0.75 t ha–1; BF1.5, 1.5 t ha–1) on morpho-physiological traits, total N and K uptake, water use, and yield in peanut and soil N and K availability under water treatments (WW, well-watered; MS, moderate water stress; SS, severe water stress). In the WW and MS treatments, application of biochar-based fertilizer increased main stem height, leaf area, chlorophyll content, photosynthetic rate, total N and K uptake, water use efficiency, and yield in peanut, and soil N and K availability, relative to BF0. The combination of moderate water stress and 0.75 t ha–1 biochar-based fertilizer (IMSBF0.75 treatment) had 28.3% (2016) and 22.8% (2017) higher peanut yield than the conventional practice (IWWBF0 treatment). BF1.5 and BF0.75 produced similar peanut yields in all water treatments. The enhanced peanut yield with biochar-based fertilizer could be attributed to increases in main stem height, leaf area, chlorophyll content, photosynthetic rate, and total N and K uptake. Severe water stress decreased morpho-physiological traits, total N and K uptake, and yield in peanut, while moderate water stress maintained these traits, compared to the well-watered treatment. Thus, peanuts can sustain growth under moderate water stress. Biochar-based fertilizer alleviated the adverse effect of water stress on growth, nutrient uptake, and yield in peanut. In conclusion, a biochar-based fertilizer rate of 0.75 t ha–1 under moderate water stress (60–65% field capacity) improves growth and yield in peanut and could be recommended for peanut production in arid or semi-arid areas.
Original languageEnglish
Article number107129
JournalAgricultural Water Management
Volume257
DOIs
Publication statusPublished - 1 Nov 2021

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